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Avalanche Forecast

Archived

Dec 11th, 2022–Dec 12th, 2022

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely.

Regions

Kananaskis, Bow Valley, Highwood Pass, North 40, Spray - KLakes.

We're in it for the long haul now! This snowpack is going to take some time to fix itself. Settle in and remind yourself that its just good to be outside, regardless of ski quality.

Confidence

Moderate

Avalanche Summary

Nothing new today.

Snowpack Summary

We are still trying to nail down the distribution of our snowpack's problems, today's trip took us to the Chester Lake area. While marginally better, we still found a weak and facetted snowpack. While there was no whumphing or cracking, the Nov25 persistent layer is still there, but slightly less reactive than across the road. Interestingly, the sun was strong enough to moisten the snow on steep south slopes.

As for the west side of the road, we expect little change in the last 24 hours. With the nature of our persistently poor snowpack any improvement will be measured in weeks, not days. As the surface snow stiffens (either from wind, temperature or settlement) it will bridge the weak layer below. This will give the illusion that our snowpack is improving, but in fact its actually going to be more reactive and unpredictable. The trick to managing our delicate snowpack will be monitoring the upper snowpack characteristics and using terrain to manage the uncertainty.

Weather Summary

A cloudy day on order for tomorrow. Winds will be very light from the NE to E. The morning low will be around -15 with a day time high of -8. No significant snow is expected.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be especially cautious as you transition into wind affected terrain.
  • Avoid convexities, steep unsupported terrain and rocky outcroppings.
  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.
  • Remote triggering is a concern, watch out for adjacent and overhead slopes.
  • Watch for areas of hard wind slab on alpine features.

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.